Fuse-plug



R. C. BHONSON.

Fuss PLUG.

APPLICATION FILED APR. 2, 19H.

Patnted Nov. 8, 1921.

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UNITED STATES PATENT-v OFFICE.

RALPH C. BRONSON, OF CHICAGO, ILLINOIS, ASSIGNOR T0 MULTIPLE ELECTRICCOMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

FUSE-PLUG.

Application led April 2,

To all 'whom t may concern.'

Be it known that I, RALPH C. BRoNsoN, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois. haveinvented a certain new and usefulImprovement in Fuse-Plugs, of which thefollowing is a specification.

This invention relates to electric fuse plugs for electric circuits andhas for its object to provide a new and improved fuse plug having aplurality of pieces of Jfuse metal 'arranged so that they can besuccessively used, the plug being further arranged sol as to prevent anyinjury or bad effect from the blowing of the pieces of fuse metal. Theinvention is illustrated in the accompanying drawings wherein- Figure 1is a view showing a plug embodying the invention.

Fig. 2 is a sectional view taken on line 2 2 of Fig. 1, with the yholesfor the fuse metal unfilled. i

Fig. 3 is a sectional view similar to Fig. 2 except that it is taken atan angle of 90 degrees from the section of Fig. 2, with the holes forthe fuse metal filled.

Fig. 4 is an enlarged top View of the fuse holding section.

Fig. 5 is a view showing one form of fuse metal piece used in the plug.

Like numerals refer -to like parts throughout the several figures.

In carrying out my invention Iv provide a fuse plug of suitableinsulating material divided into two sections, 1 and 2, the sectionsbeing separable, that is, the section 2 being a removable Section.Connected With the section l is an outer metallic piece 3 which acts asone terminal of the socket and must be constructed to serve thispurpose, and for purposes of illustration I have shown it as a sleeve.The section 2 is arranged so that it may be inserted into the socket inwhich the plug is threaded.y This metal piece is connected withthe partl in any desired manner. In the construction shown the metal piece 3 isprovided with the projections 3a which extend through openings inthepart l. On the outer face of the part 1- are small recesses 3b intowhich the ends of the part 3a project and which are filled with solderor the like to fasten the part 3a to the part 1.

The removable section 2 may be removed from the metal piece 3 but isnormali)7 held Specification of Letters Patent.

Patented Nov. 8, 1921. 1917. serial No. 159,055.

in position therein. The section 2 is hollowed out to receive a seriesof pieces of fuse metal, and for purposes of illustration I have shown aplurality of fuse receiving holes or openings 4 each adapted to receivea piece of fuse metal 5. After the pieces of iuse metal are placed inposition some noncombustible material 10 is inserted in the section 2such as plaster Paris cement or the like and which hardens'and holds thepieces of fuse metal in place, and at the same time prevents any badeffect-from the blowing of the iuse such as the iiyin'g'out of sparks,heated particles or the like. This material l0 is preferably such thatit can be poured in in liquid form and will then harden, although 1t maybe applied in any other manner which will produce a hardened' coresurrounding the or embedding the pieces of fuse material. These piecesof fuse metal are electrically7 connected at the lower end to a centralpart or washer 6 which acts as a contact for the plug and which engagesa suitable contact in the socket so as to connect any one of the fusemetal pieces 5 in circuit. This washer is preferably provided with aseries of projections 6a which project into the openings 4 and engagethe pieces of fuse metal 5, the ends thereof being also embedded in thematerial 10. When the fuse is blown, the fuse metalwill meltintermediate the points where 6a and 9a contact the fuse metal and hencethe action will all be within the core of material 10. The pieces offuse metal are preferably longer than the section 2 or at least are ofsuch length that the ends thereof may project beyond said section andthe section l is preferably provided with receiving openings 7 forreceiving these ends. The metal piece 3 which acts as one of theterminals of the plug is provided With a contact piece 8, which may bebrought into contact with any one of the pieces of fuse metal. When itis desired to make this contact the piece of fuse metal is bent over theedge of the section 2 and then when the section is connected with themetallic piece 3 in its operative position and pushed tothe limit of itsinward movement, electrical connection is made with the'contact piece 8so as to connect the fuse metal in circuit with the metal piece 3. Iprefer to provide the section 2 with openings 9 for the bent ends of thepieces of fuse metal. I also prefer to provide a piece 9a withl oneendin the opening 9, "the `piece 9a voverlapping the bent end of thefuse metal and projectingintothe openingt so that, this 'end' engagesthe fuse metalninside of,V

Y the core. rlhis prevents sparks of hot Inaterial from being scatteredabout. The pieces 9a cover the ends of the pieces of fuse metalV vandthe openings inthe solid'material Y pfrThe fuse metal may be placed-inthe core.

into which the piecesrof fuse metal are embedded, and thus prevent theescape of any products such as melted metal or gases from said openingswhen the fuse isblown. This construction therefore insures theprevention of the escape ofmetal or gases even though Ythe, entire fusewire 'should be melted. :Therouter shell of porcelain or other materialsurrounding the core act-s as aI casing for the core and wherethepressure due to the AAblowing of the fuse is too great for the-,coreto stand, this casing prevents the core from. being cracked or otherwiseinjured when the fuse isvblown.

outside of the plug and then the entirecore and fuse metal placed: inthe plug, although I prefer-sto simply pour in the plug materialafterlthe fuse metal pieces are placed in the plug. The fuse metalpieces may-,be arranged inany desired manner, butI prefer to have thetwoV pieces in opposite holes con nected together, as shown in Fig; 5,there being anenlargement 5? at the point where Y the'fuse -inetalcrosses'the bottom of the plug, the two sections'ofjfuse metal formingthe four' fuses p crossingVv each other substantially at right angles.When theY fuse is constructed in this manner and the current Vz' throughitis comparatively light but is still sufficient to blow the` fuse, thefuse metal will meltintermediate the points where 6a If the load isexcessive,rthe entire fuse metal between these two points may melt, but'in any event-,it

'will beseen that the part of the fuse metal Y that melts is entirelywithin the'plug, and

that nothing can--escapejduringl the blow- Y ing of the `fuse,`theVmelting part Vof the fuse being sealed in the plug. The section 2 is YVpreferablyprovided 'with the upstanding V Y portion ofthe fuse metalthat melts to a ribs '3c whichldfitinto the corresponding slots vin thesection l and which hold the two sectionsv against rotation and insurethe, second section-being turned the proper Vamount to bringfthe fusemetal piece'in contact with thecontact piece 8. Y It is; of; greatimportance to lconfine the Y `portion*thereofsealed inthefplug and whileI haveshown one means of doing-this, it

mightfbe accomplished in 'any other desired manner. In the constructionshown, this result secured by what consists Yin reality in reducing thecross sectional areaV of fuse metal for a portionY ofthe length thereoflsealedin the plug so that this Yportion cannot carry as much currentVas the portions out- .vside ofthe plug. I have described in detail aparticular construction, but it is ofcourse evident that the parts maybe varied in many tion relating to the embedding of the fuse i 'metal ina core to prevent the production of gases and hot flying metahwhe'n thefuse blows, may be applied and used! in connection with a single fuse. Afuse-plug of this kind with a single fuse is perfectly safe as when itis blown, no gas or hot flying metal-will be produced, the 4'pointwhere' the fuse is blown being sealed from the air 'and the oxygenthereof cannot act as is the case with a'fuse blown injtheair.

' I claim: Y 1

l. Afuse plug comprising two sections of insulating material, aV,metallic piece I conf i nected with one section and projectingtherefrom, theV other section being "formed with a plurality ofopenings, a piece offuseinetal in each of said openings@ piece'vof'con'ducting material vrat veach end of each piece offuse metal'and' engaging and overlapping theV saine, said piece ofconducting'material projecting part way into saidopenings, a Vcore ofsolid material in each ofl said openings and surrounding a portion ofleach pieceY of fuse metal and a portion of each of said pieces ofconducting material', and means for successively connecting said pieces'ofi fuse Y metal in circuit. j'

' 2. A fuse plug comprising two sections of insulating material, VVametallic piece connected with one section andprojecting there- '1 from,the'votherfsectionrbeing formed with n a plurality of openings, apieceof fuse metal in each of said openings, a contact piece at one end ofthe sectioncontaining thepieces of fuse'inetal and having projectionsthereon j@ which projectpart way into said opening and engage thepiecesof 'fuse metal therein,

a conducting piece associated with'eachvpiece Y,

of fuse metal at the other end of said section,

said conducting pieces projecting part way i" into said openings andengaging -said pieces of fuse metal therein,V a contact piece connectedwith said metallic 'piece and'ad'aptedV to be successiyelybrought intoelectrical connection Vwith 'said' pieces' of fuse metal Vand a coreofsolid material-in each of saidropen-V ings and surrounding a portionofsaid pieces of fuse metal! and a portion of the projec- Y' tion onithe'contact atfone endof the'section containing the pieces of fuse metaland also surrounding a portion of the conducting piece at the other endthereof.

3. A fuse plug comprising a section of insulating material containing aplurality of pieces of fuse metal, pieces of conducting material at theends of the pieces of fuse metal and engaging and overlapping the same,the bodj7 of the fuse metal and a portion of the overlapping pieces ofconducting material embedded in solid material so that the melting ofthe fuse metal is confined to the portions thereof embedded in saidsolid material, said pieces of conducting material being attached to thesection and projecting over the ends of the pieces of fuse metal so asto cover the same, and means for successively connecting said pieces offuse metal in circuit.

4. A fuse plug comprising two relatively removable sections, one of saidsections being provided with a plurality of openings, a piece of fusemetal in each of said openings, a piece of conducting material at eachend of each piece of fuse metal and engaging and overlapping the same,said piece of conducting material projecting partway into said openings,a core of solid material in each of said openings and surrounding aportion of each piece of fuse metal, and a portion of each of saidpieces of conducting material, and means for successively connectingsaid pieces of fuse metal in circuit.

5. A fuse plug comprising two separable and relatively movable sections,a plurality of pieces of fuse metal contained within one of saidsections, an exposed contact at one end of the section containing thepieces of :fuse metal and with which said pieces of fuse metal areelectrically connected, a piece of conducting material overlapping theother end of each of said pieces or' fuse metal, said pieces of fusemetal and the ends of said pieces of conducting material embedded insolid material, said pieces of conducting material projecting over theends 0I" the pieces of fuse metal and the material in which they areembedded so as to act as covers to cover the ends of said pieces of fusemetal to prevent the escape of particles of fuse metal produced when thefuse is blown, a separate contact piece connected with the other sectionand adapted to overlap one of the pieces of conducting materialassociated with the pieces of fuse metal, an outer metallic piece r withwhich said separate contact piece is connected, and means forsuccessively connecting said contact piece with said pieces ofconducting material so as to successively connect said pieces oi fusemetal in the circuit.

6. A fuse plug of the type described, comprising an insulating bodyhaving a separable portion, provided with a longitudinally extendingchannel; a fuse arranged in said channel having an end secured betweenan inner :tace of said body and the adjacent face of said portion; andbarrier means eX- tending across said end and the end of said channelfor preventing the escape of particles of said fuse on blowing.

In testimony whereof, I ailix my signature in the presence of twowitnesses this 29th day of March 1917.

RALPH C. BRON SON. Witnesses:

.MARIAN INGRAHAM,

LYDIA M. SYLvANUs.

